JCMT beam efficiencies

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JCMT beam efficiencies

JCMT Current Calibrations

The suite of heterodyne instruments at JCMT perform observations of standard sources on a nightly basis. Presented here are some of the most recent calibration data from the instruments in operation. It should be apparent that no single measurement made on an individual night should be relied upon as an absolute standard, and the data presented here are meant only as a guide to general instrument performance.

Calibration archive

The following tables provides links to the current RxA3 Calibration Archive and HARP Calibration Archive provide a (nearly) complete lists of calibration standards observed by the heterodyne instruments between April 2007 and January 2008. The integrated and peak intensity values should be considered a guide only. Comparison, or 'expected' intensity values are selected from standard spectra observed extensively with the DAS. For HARP, the comparison values were taken from averages of observations with the retired receiver B3.

The list of observations provides observation date, number, transition, integrated and peak intensity and a comparative set of values from a typical observation from RxB3. Finally, for reference, it gives the observation mode and bandwidth.

For sources and transitions where enough calibrations have been taken, plots are presented of the integrated intensities values as a function of observation date.

Average spectra of these standard sources (only 250 and 1000 MHz) are given here for RxA3 and HARP.
Data files for individual observations can be obtained from the public archive at CADC.

SOURCE
LIST OF
OBSERVATIONS
OBSERVATION
PLOTS

CRL2688
CO(3-2)
CO(3-2)

OTHER
13CO(3-2)

CRL618
CO(3-2)
CO(3-2)

OTHER
13CO(3-2)

OH231.8
CO(3-2)

IRC+10216
CO(3-2)
CO(3-2)

OTHER
CS(7-6)

16293-2422
CO(3-2)
CO(3-2)

OTHER
C18O(3-2)
HCO+(4-3)

NGC6334I
OTHER

W75N
CO(3-2)
CO(3-2)

OTHER
N2H+

W3(OH)
CO(3-2)
CO(3-2)

OTHER
C18O(3-2)

L1551-IRS5
CO(3-2),OTHER

OMC1
CO(3-2),OTHER

N2071IR
CO(3-2),OTHER
CO(3-2)

G34.3
CO(3-2)
CO(3-2)

OTHER
13CO(3-2)
CH3OH
HCO+(4-3)

NGC7027
CO(3-2)

N7538IR
CO(3-2), OTHER

Beam Efficiencies

Using standards observations of Uranus, Jupiter and Mars (when its diameter is small), the following plot shows the derived beam efficiencies for HARP over 2007 to February 2008. These efficiencies are derived as described on the JCMT beam efficiencies page.

HARP beam efficiencies 2007

Contact: Per Friberg. Updated: Fri Dec 19 16:10:59 HST 2008

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